Abstract
X-ray diffraction measurement determined that a newly synthesized nanocrystalline tungsten nitride (W2 N) has a substantially larger cell parameter than its bulk material. Yet the lattice of a metal nanocrystalline tungsten (W) remained unchanged. High-pressure diffraction study to 31 GPa resolved a much lower bulk modulus of 240 GPa for nanocrystalline W2 N and a relatively unchanged bulk modulus of 307 GPa for nanocrystalline W compared to its bulk material. We found that the metallic bonding of a metal is not affected by reduction of the grain size. The enlarged cell parameter and the relatively low bulk modulus of W2 N reflect the size effect of nanocrystalline W2 N.
Original language | English |
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Article number | 013525 |
Journal | Journal of Applied Physics |
Volume | 102 |
Issue number | 1 |
DOIs | |
State | Published - 2007 |